Computer Networks_2

What is the primary purpose of port numbers in the Transport layer?

• To identify devices on a network

• To identify applications or services on a device

• To route packets between networks

• To encrypt data during transmission

What is the range of well-known port numbers used at the Transport layer?

• 0–1023

• 1024–49151

• 49152–65535

• 0–65535

Which of the following is true about IPv6?

• It uses 32-bit addresses

•  It is backward compatible with IPv4

• It provides a larger address space than IPv4

• It does not support multicast

 If a packet is lost during transmission, which layer is responsible for detecting and retransmitting it in a TCP connection?

• Application

• Transport

•  Internet

•  Network Access

If a device can access a website using its IP address but not its domain name, which protocol is likely failing?

• DHCP

• DNS

• ARP

• ICMP

What is a MAC address?

• A logical address assigned by a network administrator

• A physical address embedded in a network interface card (NIC)

• An address used to identify devices on the internet

• A temporary address assigned by DHCP

Which of the following is a valid IPv4 address?

• 192.168.1.256

• 10.0.0.1

• 2001:0db8:85a3::8a2e:0370:7334

•  192.168.1.1.1

What happens if two devices on the same network have the same IP address?

• Both devices will function normally

• Only one device will be able to communicate

• The network will automatically assign a new IP address to one device

• Both devices will experience IP address conflicts and connectivity issues

Can two applications on the same device use the same port number?

• Yes, if they use different protocols (e.g., TCP and UDP)

• No, port numbers must be unique for all applications

• Yes, if they are running on different devices

• No, port numbers are unique globally

Which of the following is true about port numbers in the range 49152–65535?

• They are well-known ports

• They are registered ports

• They are dynamic or private ports

• They are reserved for multicast communication